Added boot tweak substage to stage2. Having the init_resize at the end of cmdline.txt causes boot failure after first boot for some reason. Changed some default network details. Disabled bluetooth for normal UART operation and serial console

stage2/03-boot-tweaks/00-run.sh

@@ -0,0 +1,5 @@
+#!/bin/bash -ex
+
+install -m 644 files/cmdline.txt ${ROOTFS_DIR}/boot/
+install -m 644 files/config.txt ${ROOTFS_DIR}/boot/
+install -m 644 files/interfaces ${ROOTFS_DIR}/etc/network/

stage2/03-boot-tweaks/files/cmdline.txt

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+dwc_otg.lpm_enable=0 console=ttyAMA0,115200 console=ttyAMA0,115200 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait

stage2/03-boot-tweaks/files/config.txt

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+# For more options and information see
+# http://www.raspberrypi.org/documentation/configuration/config-txt.md
+# Some settings may impact device functionality. See link above for details
+
+# uncomment if you get no picture on HDMI for a default "safe" mode
+#hdmi_safe=1
+
+# uncomment this if your display has a black border of unused pixels visible
+# and your display can output without overscan
+#disable_overscan=1
+
+# uncomment the following to adjust overscan. Use positive numbers if console
+# goes off screen, and negative if there is too much border
+#overscan_left=16
+#overscan_right=16
+#overscan_top=16
+#overscan_bottom=16
+
+# uncomment to force a console size. By default it will be display's size minus
+# overscan.
+#framebuffer_width=1280
+#framebuffer_height=720
+
+# uncomment if hdmi display is not detected and composite is being output
+#hdmi_force_hotplug=1
+
+# uncomment to force a specific HDMI mode (this will force VGA)
+#hdmi_group=1
+#hdmi_mode=1
+
+# uncomment to force a HDMI mode rather than DVI. This can make audio work in
+# DMT (computer monitor) modes
+#hdmi_drive=2
+
+# uncomment to increase signal to HDMI, if you have interference, blanking, or
+# no display
+#config_hdmi_boost=4
+
+# uncomment for composite PAL
+#sdtv_mode=2
+
+#uncomment to overclock the arm. 700 MHz is the default.
+#arm_freq=800
+
+# Uncomment some or all of these to enable the optional hardware interfaces
+#dtparam=i2c_arm=on
+#dtparam=i2s=on
+#dtparam=spi=on
+
+# Uncomment this to enable the lirc-rpi module
+#dtoverlay=lirc-rpi
+
+# Additional overlays and parameters are documented /boot/overlays/README
+
+# Enable audio (loads snd_bcm2835)
+dtparam=audio=on
+
+# Disable bluetooth and move UART back to the original pllc
+dtoverlay=pi3-disable-bt

stage2/03-boot-tweaks/files/interfaces

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+auto lo
+
+iface lo inet loopback
+iface eth0 inet dhcp
+
+allow-hotplug eth0
+iface eth0 inet dhcp
+metric 0
+address 192.168.0.100
+netmask 255.255.255.0
+gateway 192.168.0.1